[PATCH] net: add net namespace inode for all net_dev events

[Tony Lu]

There are lots of net namespaces on the host runs containers like k8s.
It is very common to see the same interface names among different net
namespaces, such as eth0. It is not possible to distinguish them without
net namespace inode.

This adds net namespace inode for all net_dev events, help us
distinguish between different net devices.

Output:
  <idle>-0       [006] ..s.   133.306989: net_dev_xmit: net_inum=4026531992 dev=eth0 skbaddr=0000000011a87c68 len=54 rc=0

Signed-off-by: Tony Lu <tonylu@xxxxxxxxxxxxxxxxx>
---
 include/trace/events/net.h | 35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/include/trace/events/net.h b/include/trace/events/net.h
index 2399073c3afc..a52f90d83411 100644
--- a/include/trace/events/net.h
+++ b/include/trace/events/net.h
@@ -35,6 +35,7 @@ TRACE_EVENT(net_dev_start_xmit,
 		__field(	u16,			gso_size	)
 		__field(	u16,			gso_segs	)
 		__field(	u16,			gso_type	)
+		__field(	unsigned int,		net_inum	)
 	),
 
 	TP_fast_assign(
@@ -56,10 +57,12 @@ TRACE_EVENT(net_dev_start_xmit,
 		__entry->gso_size = skb_shinfo(skb)->gso_size;
 		__entry->gso_segs = skb_shinfo(skb)->gso_segs;
 		__entry->gso_type = skb_shinfo(skb)->gso_type;
+		__entry->net_inum = dev_net(skb->dev)->ns.inum;
 	),
 
-	TP_printk("dev=%s queue_mapping=%u skbaddr=%p vlan_tagged=%d vlan_proto=0x%04x vlan_tci=0x%04x protocol=0x%04x ip_summed=%d len=%u data_len=%u network_offset=%d transport_offset_valid=%d transport_offset=%d tx_flags=%d gso_size=%d gso_segs=%d gso_type=%#x",
-		  __get_str(name), __entry->queue_mapping, __entry->skbaddr,
+	TP_printk("net_inum=%u dev=%s queue_mapping=%u skbaddr=%p vlan_tagged=%d vlan_proto=0x%04x vlan_tci=0x%04x protocol=0x%04x ip_summed=%d len=%u data_len=%u network_offset=%d transport_offset_valid=%d transport_offset=%d tx_flags=%d gso_size=%d gso_segs=%d gso_type=%#x",
+		  __entry->net_inum, __get_str(name), __entry->queue_mapping,
+		  __entry->skbaddr,
 		  __entry->vlan_tagged, __entry->vlan_proto, __entry->vlan_tci,
 		  __entry->protocol, __entry->ip_summed, __entry->len,
 		  __entry->data_len,
@@ -82,6 +85,7 @@ TRACE_EVENT(net_dev_xmit,
 		__field(	unsigned int,	len		)
 		__field(	int,		rc		)
 		__string(	name,		dev->name	)
+		__field(	unsigned int,	net_inum	)
 	),
 
 	TP_fast_assign(
@@ -89,10 +93,12 @@ TRACE_EVENT(net_dev_xmit,
 		__entry->len = skb_len;
 		__entry->rc = rc;
 		__assign_str(name, dev->name);
+		__entry->net_inum = dev_net(skb->dev)->ns.inum;
 	),
 
-	TP_printk("dev=%s skbaddr=%p len=%u rc=%d",
-		__get_str(name), __entry->skbaddr, __entry->len, __entry->rc)
+	TP_printk("net_inum=%u dev=%s skbaddr=%p len=%u rc=%d",
+		__entry->net_inum, __get_str(name), __entry->skbaddr,
+		__entry->len, __entry->rc)
 );
 
 TRACE_EVENT(net_dev_xmit_timeout,
@@ -106,16 +112,19 @@ TRACE_EVENT(net_dev_xmit_timeout,
 		__string(	name,		dev->name	)
 		__string(	driver,		netdev_drivername(dev))
 		__field(	int,		queue_index	)
+		__field(	unsigned int,	net_inum	)
 	),
 
 	TP_fast_assign(
 		__assign_str(name, dev->name);
 		__assign_str(driver, netdev_drivername(dev));
 		__entry->queue_index = queue_index;
+		__entry->net_inum = dev_net(dev)->ns.inum;
 	),
 
-	TP_printk("dev=%s driver=%s queue=%d",
-		__get_str(name), __get_str(driver), __entry->queue_index)
+	TP_printk("net_inum=%u dev=%s driver=%s queue=%d",
+		__entry->net_inum, __get_str(name), __get_str(driver),
+		__entry->queue_index)
 );
 
 DECLARE_EVENT_CLASS(net_dev_template,
@@ -128,16 +137,19 @@ DECLARE_EVENT_CLASS(net_dev_template,
 		__field(	void *,		skbaddr		)
 		__field(	unsigned int,	len		)
 		__string(	name,		skb->dev->name	)
+		__field(	unsigned int,	net_inum	)
 	),
 
 	TP_fast_assign(
 		__entry->skbaddr = skb;
 		__entry->len = skb->len;
 		__assign_str(name, skb->dev->name);
+		__entry->net_inum = dev_net(skb->dev)->ns.inum;
 	),
 
-	TP_printk("dev=%s skbaddr=%p len=%u",
-		__get_str(name), __entry->skbaddr, __entry->len)
+	TP_printk("net_inum=%u dev=%s skbaddr=%p len=%u",
+		__entry->net_inum, __get_str(name), __entry->skbaddr,
+		__entry->len)
 )
 
 DEFINE_EVENT(net_dev_template, net_dev_queue,
@@ -187,6 +199,7 @@ DECLARE_EVENT_CLASS(net_dev_rx_verbose_template,
 		__field(	unsigned char,		nr_frags	)
 		__field(	u16,			gso_size	)
 		__field(	u16,			gso_type	)
+		__field(	unsigned int,		net_inum	)
 	),
 
 	TP_fast_assign(
@@ -213,10 +226,12 @@ DECLARE_EVENT_CLASS(net_dev_rx_verbose_template,
 		__entry->nr_frags = skb_shinfo(skb)->nr_frags;
 		__entry->gso_size = skb_shinfo(skb)->gso_size;
 		__entry->gso_type = skb_shinfo(skb)->gso_type;
+		__entry->net_inum = dev_net(skb->dev)->ns.inum;
 	),
 
-	TP_printk("dev=%s napi_id=%#x queue_mapping=%u skbaddr=%p vlan_tagged=%d vlan_proto=0x%04x vlan_tci=0x%04x protocol=0x%04x ip_summed=%d hash=0x%08x l4_hash=%d len=%u data_len=%u truesize=%u mac_header_valid=%d mac_header=%d nr_frags=%d gso_size=%d gso_type=%#x",
-		  __get_str(name), __entry->napi_id, __entry->queue_mapping,
+	TP_printk("net_inum=%u dev=%s napi_id=%#x queue_mapping=%u skbaddr=%p vlan_tagged=%d vlan_proto=0x%04x vlan_tci=0x%04x protocol=0x%04x ip_summed=%d hash=0x%08x l4_hash=%d len=%u data_len=%u truesize=%u mac_header_valid=%d mac_header=%d nr_frags=%d gso_size=%d gso_type=%#x",
+		  __entry->net_inum, __get_str(name), __entry->napi_id,
+		  __entry->queue_mapping,
 		  __entry->skbaddr, __entry->vlan_tagged, __entry->vlan_proto,
 		  __entry->vlan_tci, __entry->protocol, __entry->ip_summed,
 		  __entry->hash, __entry->l4_hash, __entry->len,
-- 
2.19.1.6.gb485710b